cam_pos      = [-0.487741, 1.48469, 1.22535]';
cam_dir      = [-0.706468, 0.155545, -0.690441]';
cam_up       = [0.647997, 0.534461, -0.542634]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [-0.378531, 1.10491, 0.636235]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;